EP0803037B1 - Metal valve housing and core mold for its manufacture - Google Patents
Metal valve housing and core mold for its manufacture Download PDFInfo
- Publication number
- EP0803037B1 EP0803037B1 EP95940240A EP95940240A EP0803037B1 EP 0803037 B1 EP0803037 B1 EP 0803037B1 EP 95940240 A EP95940240 A EP 95940240A EP 95940240 A EP95940240 A EP 95940240A EP 0803037 B1 EP0803037 B1 EP 0803037B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control
- valve housing
- outer circumference
- metal rings
- metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002184 metal Substances 0.000 title claims description 21
- 229910052751 metal Inorganic materials 0.000 title claims description 21
- 238000004519 manufacturing process Methods 0.000 title claims 2
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000005266 casting Methods 0.000 claims abstract description 9
- 230000004927 fusion Effects 0.000 claims 1
- 230000003100 immobilizing effect Effects 0.000 claims 1
- 230000000717 retained effect Effects 0.000 claims 1
- 239000010959 steel Substances 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 13
- 229910001018 Cast iron Inorganic materials 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/06—Core boxes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
- F16K27/041—Construction of housing; Use of materials therefor of sliding valves cylindrical slide valves
Definitions
- the invention relates to a valve housing made of metal with highly stressed housing areas and the features from the preamble of claim 1.
- a slide valve with such a valve housing is for example from DE 36 44 269 Al known.
- the housing webs are made entirely of cast iron. During machining and also during operation there is a risk that cast iron material breaks away and the valve housing can no longer be used.
- the housing is known to be lined with a material resistant to the medium (DE 26 48 729 A1). In this known valve, the housing is only used for support the lining.
- valve housing In a directional valve housing according to DE 21 61 386 C2, the valve housing is made made of plastic, the metallic parts intended for the valve function such as guide bushing with control edges for the control piston and supply and discharge lines encloses and receives the mounting plate.
- DE 12 95 944 known a valve lifter, which is made as a composite body made of cast iron and steel is. The cast iron section is attached to the steel section by suitable measures cast on.
- valve seat In a seat valve known from FR-A 2 596 487, the valve seat is replaced by a cast metal ring formed.
- the one axial end face of the metal ring is different than with a slide valve inevitably free of casting material, since there Locking member must sit on the seat.
- the free end face on the metal ring the valve according to FR-A 2 596 487 corresponds to the cylindrical one with a slide valve Inner surface of the housing webs on which the control piston is guided.
- a valve arrangement known from US-A 4,516,594 contains several seat valves with cast-in valve seats also a slide valve with a control piston. This is located in a control bore, which is partially cast through Bush made of a material that is more resistant to the casting material is formed.
- the socket is provided with a recess on the inside, which as the Bushing around the control room.
- the two housing bars and the floor, which delimit the control chamber axially and radially, are therefore in one piece trained with each other. Such a design allows only a limited one radial depth of the control room.
- US-A 4 516 594 the thought of a plurality of wear resistant limbs before potting to form a single component.
- the invention has for its object a valve housing according to the preamble of claim 1 to develop so that it is possible in the finishing resulting committee to reduce the service life of the control edges extend and larger cross-sections of the control rooms for given external dimensions the valve body.
- the housing body of a directional control valve is cast from cast iron designated that a rotating pump control room P, not shown Consumer-related work control rooms A, B and two external ones Has tank control rooms T.
- the control rooms are through by each other Steel rings formed housing webs 2, 3, 4, 5 separately and the outside Tank control rooms T are bounded on the outside by steel rings 6 and 7.
- the steel rings 2-5 are on three sides and the steel rings 6 and 7 on two sides of the sand core 10 enclosed and introduced together with the sand core in the housing mold been.
- the free outer peripheral surface 11 of the steel rings is during the casting process with the liquid cast iron by fusing with the housing body 1 connected. After removal of the sand core 10, the inner densely hatched area 13 of the steel rings finished.
- the areas 13 are not used to guide the shown control piston and as control edges with corresponding control edges of the control piston, not shown, interact by adjacent control rooms A-T, P-B or P-A, B-T in one or the other flow direction of the medium be connected to each other.
- the measurement of the steel rings for their finishing can because of the greater strength and dimensional accuracy are kept smaller than at Cast iron. This results in larger control rooms and correspondingly smaller ones Flow losses.
- the control edges and guide surfaces of the Steel rings for the control piston are hardened afterwards, if necessary should be. Since the cast material is irrelevant for the control function, it can are of lower quality.
- the core shape 40 shown in FIG. 2 shows in the lower half 40a for receiving and simultaneous fixation of the steel rings 42 circumferential trapezoidal projections 43, which engage in circumferential grooves 44 of the steel rings.
- the grooves can be as shown have different profiles. These profiles are made during the casting process filled with liquid iron so that the rings after the cast iron solidified are firmly and tightly anchored in the housing body.
- This also applies to alternative to Grooves possible circumferential projections 46 on the outer circumference of the rings accordingly the upper half 40b of the core shape.
- the core shape has circumferential Grooves 47 for receiving the projections of the rings.
- the same groove profile or projection profile in the core shape can have different profile configurations of the projections or grooves on the circumference of the ring.
- the rings By profiling the outer circumference of the rings and the like Training of receiving profiles in the core shape, the rings sit during the Shooting the core firmly in the core shape.
- the closely hatched areas 48 of the rings form the control edges, which with corresponding control edges on Control pistons, not shown, work together and the particularly highly stressed Places in the valve housing.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Housings (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
Die Erfindung betrifft ein Ventilgehäuse aus Metall mit hochbeanspruchten Gehäusebereichen und den Merkmalen aus dem Oberbegriff des Anspruchs 1.The invention relates to a valve housing made of metal with highly stressed housing areas and the features from the preamble of claim 1.
Ein Schieberventil mit einem solchen Ventilgehäuse ist zum Beispiel aus der DE 36 44 269 Al bekannt. Bei diesem Ventil bestehen die Gehäusestege ganz aus Gußeisen. Bei der Bearbeitung und auch während des Betriebs besteht die Gefahr, daß Gußeisenmaterial wegbricht und dadurch das Ventilgehäuse nicht mehr zu gebrauchen ist.A slide valve with such a valve housing is for example from DE 36 44 269 Al known. With this valve, the housing webs are made entirely of cast iron. During machining and also during operation there is a risk that cast iron material breaks away and the valve housing can no longer be used.
Bei Ventilen, die für aggressive Medien bestimmt sind, ist es bekannt, das Gehäuse mit einem gegenüber dem Medium widerstandsfähigen Material auszukleiden (DE 26 48 729 A1). Das Gehäuse dient bei diesem bekannten Ventil lediglich zur Abstützung der Auskleidung.In the case of valves which are intended for aggressive media, the housing is known to be lined with a material resistant to the medium (DE 26 48 729 A1). In this known valve, the housing is only used for support the lining.
Bei einem Wegeventilgehäuse nach der DE 21 61 386 C2 besteht das Ventilgehäuse aus Kunststoff, der die für die Ventilfunktion bestimmten metallischen Teile wie Führungsbüchse mit Steuerkanten für den Steuerkolben und Zu- und Abführungsleitungen umschließt sowie die Befestigungsplatte aufnimmt. Ferner ist durch die DE 12 95 944 ein Ventilstößel bekannt, der als Verbundkörper aus Gußeisen und Stahl hergestellt ist. Der Gußeisenabschnitt wird an dem Stahlabschnitt durch geeignete Maßnahmen angegossen.In a directional valve housing according to DE 21 61 386 C2, the valve housing is made made of plastic, the metallic parts intended for the valve function such as guide bushing with control edges for the control piston and supply and discharge lines encloses and receives the mounting plate. Furthermore, DE 12 95 944 known a valve lifter, which is made as a composite body made of cast iron and steel is. The cast iron section is attached to the steel section by suitable measures cast on.
Bei einem aus der FR-A 2 596 487 bekannten Sitzventil wird der Ventilsitz durch einen eingegossenen Metallring gebildet. Die eine axiale Stirnfläche des Metallrings ist anders als bei einem Schieberventil zwangsläufig frei von Gußmaterial, da dort das Schließglied auf dem Sitz aufsitzen muß. Der freien Stirnfläche an dem Metallring bei dem Ventil nach der FR-A 2 596 487 entspricht bei einem Schieberventil die zylindrische Innenfläche der Gehäusestege, an der der Steuerkolben geführt ist.In a seat valve known from FR-A 2 596 487, the valve seat is replaced by a cast metal ring formed. The one axial end face of the metal ring is different than with a slide valve inevitably free of casting material, since there Locking member must sit on the seat. The free end face on the metal ring the valve according to FR-A 2 596 487 corresponds to the cylindrical one with a slide valve Inner surface of the housing webs on which the control piston is guided.
Eine aus der US-A 4 516 594 bekannte Ventilanordnung enthält neben mehreren Sitzventilen mit eingegossenen Ventilsitzen auch ein Schieberventil mit einem Steuerkolben. Dieser befindet sich in einer Steuerbohrung, die teilweise durch eine eingegossene Buchse aus einem gegenüber dem Gußmaterial widerstandsfähigeren Material gebildet ist. Die Buchse ist innen mit einer Ausdrehung versehen, die als um die Buchsenbohrung herumlaufender Steuerraum zu betrachten ist. Die zwei Gehäusestege und der Boden, die den Steuerraum axial und radial begrenzen, sind also einstückig miteinander ausgebildet. Eine solche Gestaltung ermöglicht nur eine begrenzte radiale Tiefe des Steuerraums. Durch die ganze US-A 4 516 594 hindurch zieht sich der Gedanke, eine Mehrzahl von verschleißresistenten Gliedern vor dem Vergießen zu einem einzigen Bauteil zusammenzufügen.A valve arrangement known from US-A 4,516,594 contains several seat valves with cast-in valve seats also a slide valve with a control piston. This is located in a control bore, which is partially cast through Bush made of a material that is more resistant to the casting material is formed. The socket is provided with a recess on the inside, which as the Bushing around the control room. The two housing bars and the floor, which delimit the control chamber axially and radially, are therefore in one piece trained with each other. Such a design allows only a limited one radial depth of the control room. Throughout US-A 4 516 594 the thought of a plurality of wear resistant limbs before potting to form a single component.
Der Erfindung liegt die Aufgabe zugrunde, ein Ventilgehäuses gemäß dem Oberbegriff des Patentanspruchs 1 so weiterzuentwickeln, daß es möglich ist, den bei der Fertigbearbeitung anfallenden Ausschuß zu verringern, die Standzeit der Steuerkanten zu verlängern und größere Querschnitte der Steuerräume bei gegebenen Außenabmessungen des Ventilgehäuses zu erhalten.The invention has for its object a valve housing according to the preamble of claim 1 to develop so that it is possible in the finishing resulting committee to reduce the service life of the control edges extend and larger cross-sections of the control rooms for given external dimensions the valve body.
Nach der Erfindung wird dies mit den kennzeichnenden Merkmalen des Anspruchs 1 erreicht. Dadurch, daß nur die hochbeanspruchten Gehäusebereiche aus einem diesen Beanspruchungen gewachsenen Material wie Stahl bestehen und damit in einfacher Weise als selbständige Teile mit dem Gießkern verbunden und gemeinsam mit diesen in die Gießform einzubringen sind, läßt sich der Gehäusekörper in bekannter Weise abgießen, wobei sich die mit dem Kern verbundenen selbständigen Teile formschlüssig und/oder stoffschlüssig mit dem Gehäusekörper verbinden bzw. verschmelzen.According to the invention, this is with the characterizing features of claim 1 reached. The fact that only the highly stressed housing areas from one of these Stresses grown material such as steel exist and thus in simpler Way connected as independent parts with the casting core and together with these are to be introduced into the casting mold, the housing body can be known Pour off, the independent parts connected to the core form-fitting and / or connect or fuse with the housing body.
Weitere Einzelheiten der Erfindung ergeben sich aus den Unteransprüchen sowie der nachfolgenden Beschreibung von Ausführungsbeispielen.Further details of the invention emerge from the subclaims and following description of exemplary embodiments.
Es zeigen
- Figur 1
- einen Axialschnitt durch ein abgegossenes Wegeventilgehäuse mit Sandkern und
Figur 2- einen Axialschnitt durch eine Kernform für das Wegeventilgehäuse nach Figur 1.
- Figure 1
- an axial section through a cast directional valve housing with sand core and
- Figure 2
- an axial section through a core shape for the directional control valve housing according to Figure 1.
In Figur 1 ist mit 1 der aus Gußeisen abgegossene Gehäusekörper eines Wegeventils
bezeichnet, das einen umlaufenden Pumpensteuerraum P, mit nicht dargestellten
Verbrauchern in Verbindung stehende Arbeitssteuerräume A, B sowie zwei außenliegende
Tanksteuerräume T aufweist. Die Steuerräume sind untereinander durch von
Stahlringen gebildete Gehäusestege 2, 3, 4, 5 getrennt und die außenliegenden
Tanksteuerräume T sind nach außen von Stahlringen 6 und 7 begrenzt. Die Stahlringe
2 bis 5 sind an drei Seiten und die Stahlringe 6 und 7 an zwei Seiten von dem Sandkern
10 umschlossen und gemeinsam mit dem Sandkern in die Gehäusegießform eingebracht
worden. Die freie äußere Umfangsfläche 11 der Stahlringe wird beim Gießvorgang
mit dem flüssigen Gußeisen durch Verschmelzen mit dem Gehäusekörper 1
verbunden. Nach Entfernen des Sandkernes 10 wird der innere dichter schraffierte Bereich
13 der Stahlringe fertigbearbeitet. Die Bereiche 13 dienen zur Führung des nicht
dargestellten Steuerkolbens und als Steuerkanten, die mit entsprechenden Steuerkanten
des nicht gezeigten Steuerkolbens zusammenwirken, indem benachbarte Steuerräume
A-T, P-B bzw. P-A, B-T in die eine oder andere Durchflußrichtung des Mediums
miteinander verbunden werden. Während der Fertigbearbeitung der Stahlringe besteht
keine Gefahr, daß diese im Bereich der Steuerkanten ausbrechen können wie dies bei
herkömmlichen Ventilgehäusen, bei denen auch die Gehäusestege aus Gußeisen
bestehen, der Fall ist. Das Aufmaß der Stahlringe für deren Fertigbearbeitung kann
wegen der größeren Festigkeit und Maßhaltigkeit kleiner gehalten werden als bei
Gußeisen. Damit ergeben sich größere Steuerräume und entsprechend kleinere
Durchflußverluste. Außerdem können die Steuerkanten und Führungsflächen der
Stahlringe für den Steuerkolben nachträglich gehärtet werden, falls dies erforderlich
sein sollte. Da der Gußwerkstoff für die Steuerfunktion ohne Bedeutung ist, kann dieser
eine geringere Qualität aufweisen.In FIG. 1, the housing body of a directional control valve is cast from cast iron
designated that a rotating pump control room P, not shown
Consumer-related work control rooms A, B and two external ones
Has tank control rooms T. The control rooms are through by each other
Steel rings formed
Die in Figur 2 gezeigte Kernform 40 zeigt in der unteren Hälfte 40a zur Aufnahme und
gleichzeitigen Fixierung der Stahlringe 42 umlaufende trapezförmige Vorsprünge 43,
die in umlaufende Nuten 44 der Stahlringe eingreifen. Die Nuten können wie dargestellt
verschiedene Profile aufweisen. Diese Profile werden während des Gießvorganges
mit flüssigem Eisen ausgefüllt, so daß die Ringe nach dem Erstarren des Gußeisens
im Gehäusekörper fest und dicht verankert sind. Dies gilt auch bei alternativ zu
Nuten möglichen umlaufenden Vorsprüngen 46 am Außenumfang der Ringe entsprechend
der oberen Hälfte 40b der Kernform. In diesem Fall weist die Kernform umlaufende
Nuten 47 zur Aufnahme der Vorsprünge der Ringe auf. Das gleiche Nutenprofil
bzw. Vorsprungprofil in der Kernform kann verschiedene Profilausbildungen der Vorsprünge
bzw. Nuten am Umfang der Ring aufnehmen.The
Durch die profilierte Ausbildung des Außenumfanges der Ringe und entsprechender
Ausbildung von Aufnahmeprofilen in der Kernform sitzen die Ringe während des
Schießens des Kernes unverrückbar in der Kernform fest. Die eng schraffierten Bereiche
48 der Ringe bilden die Steuerkanten, die mit entsprechenden Steuerkanten am
nicht dargestellten Steuerkolben zusammenarbeiten und die besonders hoch beanspruchten
Stellen im Ventilgehäuse sind.By profiling the outer circumference of the rings and the like
Training of receiving profiles in the core shape, the rings sit during the
Shooting the core firmly in the core shape. The closely hatched
Claims (10)
- A valve housing made from metal for a hydraulic spool valve with a cast housing body (1) having a control bore for the purpose of accommodating a control spool which is axially displaceable within the control bore, whereby several annular control chambers (A, B, P, T) extending circumferentially around the control bore are arranged axially spaced in relation to each other and separated by housing lands which, for the purpose of forming control edges (13), are finish-machined at their inner surface facing the control bore and, within a control edge zone of limited radial depth, at at least one of their axial lateral faces
characterized in that each of the several housing lands is developed, at least in the finish-machined zone, as a distinct metal ring (2, 3, 4, 5, 42) consisting of a material capable of withstanding to a large extent the forces to be exerted upon it and joined to the housing body (1) during casting of the housing body (1), these metal rings (2, 3, 4, 5, 42) having a lateral face axially limiting a control chamber (A, B, P, T), which lateral face is free of cast material over an area extending beyond the finish-machined zone. - A valve housing according to Claim 1, characterized in that the lateral faces of the metal rings (2, 3, 4, 5, 42) are free of cast material up to an edge between a lateral face and the outer circumference of the metal rings (2, 3, 4, 5, 42) and that the metal rings (2, 3, 4, 5, 42) are axially retained in the cast body (1) at their outer circumference.
- A valve housing according to Claim 1 or 2, characterized in that the metal rings (2, 3, 4, 5, 42) are joined metallically with the housing body (1) through fusion at the contact points with the housing body (1) during casting.
- A valve housing according to any of the preceding claims, characterized in that the metal rings (2, 3, 4, 5, 42) are provided with a recess (44) or a projection (46) at their outer circumference.
- A valve housing according to Claim 4, characterized in that the metal rings (2, 3, 4, 5, 42) are provided with at least one annular groove extending around their outer circumference.
- A valve housing according to Claim 4, characterized in that the metal rings (2, 3, 4, 5, 42) are provided with at least one annular strap (46) extending around their outer circumference.
- A valve housing according to Claim 2, characterized in that the control chambers (A, B, P, T) extend radially deeper than the edge between the exposed lateral faces and the outer circumference of the adjoining metal rings (2, 3, 4, 5, 42) and that the control chambers (A, B, P, T) have the same axial width beyond the edge as in the area of the metal rings (2, 3, 4, 5, 42).
- A valve housing according to any of the preceding claims, characterized in that, viewed axially, two outer control chambers (T) and at least one inner control chamber (A, B, P) are present and that the outer control chambers (T) are axially limited on their outer side as seen from the inner control chamber (A, B, P) by a cast-in metal ring (6, 7, 42).
- A core mould (40) for the production of a valve housing according to Claim 4, characterized in that, for the purpose of accommodating and immobilizing a metal ring (2, 3, 4, 5, 42), the core mould is provided with a recess (47) to accommodate a projection (46) at the outer circumference of the metal ring (2, 3, 4, 5, 42) or a projection (43) that extends into a recess (44) at the outer circumference of the metal ring (2, 3, 4, 5, 42).
- A core mould (40) according to Claim 9, characterized in that its recess (47) or projection (43) is developed with a trapezoidal cross-section.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19500605 | 1995-01-11 | ||
| DE19500605A DE19500605A1 (en) | 1995-01-11 | 1995-01-11 | Cast body |
| PCT/EP1995/004633 WO1996021818A1 (en) | 1995-01-11 | 1995-11-24 | Metal valve housing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0803037A1 EP0803037A1 (en) | 1997-10-29 |
| EP0803037B1 true EP0803037B1 (en) | 2000-01-19 |
Family
ID=7751273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95940240A Expired - Lifetime EP0803037B1 (en) | 1995-01-11 | 1995-11-24 | Metal valve housing and core mold for its manufacture |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5911407A (en) |
| EP (1) | EP0803037B1 (en) |
| JP (1) | JP3759614B2 (en) |
| DE (2) | DE19500605A1 (en) |
| WO (1) | WO1996021818A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19701085A1 (en) * | 1997-01-15 | 1998-07-16 | Kolbenschmidt Ag | Casting engine piston using support ring |
| DE19703399A1 (en) * | 1997-01-30 | 1998-08-06 | Itt Mfg Enterprises Inc | Method for producing a housing block for a hydraulic unit |
| GB2352664A (en) * | 1999-07-06 | 2001-02-07 | Ford Global Tech Inc | Engine shaft casting process including preformed slug member |
| DE10119271A1 (en) * | 2001-04-20 | 2002-10-24 | Zahnradfabrik Friedrichshafen | Control or regulation valve, comprises injection molded upper and lower mold halves that align correctly preventing friction hysteresis |
| US20040238780A1 (en) * | 2003-06-02 | 2004-12-02 | Gethmann Doug P. | Control valve with integrated hardened valve seat |
| EP2319639A1 (en) | 2009-11-10 | 2011-05-11 | Georg Fischer Automobilguss GmbH | Cast iron axle leg with moulded steel core - method for manufacturing the axle leg |
| DE102011076048A1 (en) * | 2011-05-18 | 2012-11-22 | Bosch Mahle Turbo Systems Gmbh & Co. Kg | Producing cast housing of exhaust gas turbocharger of internal combustion engine with wastegate-valve device, by inserting sleeve for bearing a shaft carrying valve disc of valve device and/or valve seat, and casting a material of housing |
| DE102014202744A1 (en) * | 2014-02-14 | 2015-08-20 | Siemens Aktiengesellschaft | Protection against erosion and erosion corrosion on webs of cast casings |
| CN112756586B (en) * | 2020-12-22 | 2022-06-14 | 湖南江滨机器（集团）有限责任公司 | Mould and technological method for casting cast iron inlaid ring with cavity |
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| US4516594A (en) * | 1984-04-03 | 1985-05-14 | Diesel Equipment Limited | Multi-part valve with a valve seat skeleton and cast valve body |
| FR2594518B3 (en) * | 1986-02-17 | 1988-02-12 | Feurs Fonderies Acieries Elect | SEALING RING AND ITS APPLICATION TO THE IMPLEMENTATION OF A PROCESS FOR MANUFACTURING A MOLDED BODY TO OFFER A SEAT TO A SHUTTERING BODY, PARTICULARLY FOR TAPS |
| FR2596487A1 (en) * | 1986-03-27 | 1987-10-02 | Sereg Soc | Method for producing a pipework fitting component, and pipework fitting component obtained by implementing the said method |
| DE3644269A1 (en) * | 1986-12-23 | 1988-07-07 | Rexroth Mannesmann Gmbh | 2-WAY VALVE |
| DE9317131U1 (en) * | 1993-11-09 | 1994-01-27 | Rafeld Kunststofftechnik GmbH & Co. KG, 87640 Biessenhofen | Angle seat valve |
| DE9407083U1 (en) * | 1994-04-28 | 1994-07-07 | Festo Kg, 73734 Esslingen | Spool valve |
-
1995
- 1995-01-11 DE DE19500605A patent/DE19500605A1/en not_active Withdrawn
- 1995-11-24 EP EP95940240A patent/EP0803037B1/en not_active Expired - Lifetime
- 1995-11-24 JP JP52139296A patent/JP3759614B2/en not_active Expired - Fee Related
- 1995-11-24 DE DE59507659T patent/DE59507659D1/en not_active Expired - Lifetime
- 1995-11-24 WO PCT/EP1995/004633 patent/WO1996021818A1/en active IP Right Grant
- 1995-11-24 US US08/875,332 patent/US5911407A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0803037A1 (en) | 1997-10-29 |
| WO1996021818A1 (en) | 1996-07-18 |
| DE59507659D1 (en) | 2000-02-24 |
| JPH10512035A (en) | 1998-11-17 |
| US5911407A (en) | 1999-06-15 |
| JP3759614B2 (en) | 2006-03-29 |
| DE19500605A1 (en) | 1996-07-18 |
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